ALFA: Arecibo L-Band Feed Array

The Arecibo L-band Feed Array (ALFA) is a seven feed system that allows
large-scale surveys of the sky to be conducted with unprecedented sensitivity
using the 305-m Arecibo telescope in Puerto Rico. ALFA, operating near 1.4 GHz,
consists of a cluster of seven cooled dual-polarization feeds, a fiber-optical
transmission system, and digital back-end signal processors.